This is a simple 4 W fluorescent lamp driver circuit that can be operated from a 12 V supply. The first part of the circuit includes a NE555 timer IC wired as an astable multivibrator. The output pulses from the IC are amplified by the transistor Q1. The transformer steps up the collector voltage to around 1KVto drive the fluorescent lamp. Before usi
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ng the circuit, set the R2 at full resistance and switch on the supply, now adjust R2 so that the collector current is 300mA (use a multimeter) and this is the optimum setting for the lamp. Operating the lamp in this setting will give a better life. First, the tube is being started with cold cathodes. Tube life will be shortened as the cathode coating is gradually stripped. This isn`t just a feature of this circuit, but all those cheap battery operated torches having tubes with blackened ends. Incidentally, as there is a DC component present in the tube supply because of the single ended drive to the transformer, one end of the tube will wear out before the other. Because of the low efficiency of using a mains transformer (operating outside intended frequency range and with the interleaved core laminations saturating because of the DC component), the tube will not receive full 4W of power. Besides, 300mA @ 12V is only 3. 6W. Therefore, it will not be as bright as one operated from the mains. A push pull converter, running at high frequency, using a ferrite transformer, and having filament windings to warm to cathodes is the best way to operate fluorescent tubes from low voltage DC.
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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